EP 0844787 B1 20010801 - Dynamic focusing apparatus for cathode-ray tube display device
Title (en)
Dynamic focusing apparatus for cathode-ray tube display device
Title (de)
Dynamisches Fokussierungsgerät für Kathodenstrahlröhren-Darstellungsvorrichtung
Title (fr)
Appareil de focalisation dynamique pour dispositif d'affichage à tube cathodique
Publication
Application
Priority
- JP 32595296 A 19961121
- JP 32795796 A 19961122
Abstract (en)
[origin: EP0844787A1] A dynamic focusing apparatus is comprised of a parabolic voltage generating device for generating a parabolic; voltage Vpb1 across a capacitor 9M by applying a horizontal flyback pulse Vp to a series circuit of an inductor 8 and the capacitor, a coupling device 10 for supplying the parabolic voltage to a focus electrode "f" of a cathode-city tube, the capacitor which includes a plurarity of capacitors 9S, an electronic switching device 11 for selectively connecting some of the plurarity of capacitors for a time duration corresponding to an approximate center of a horizontal scanning period and for disconnecting the same of the plurality of capacitors for other duration, and a switching control device for controlling the electronic switching device. <IMAGE>
IPC 1-7
IPC 8 full level
CPC (source: EP KR US)
H04N 3/223 (2013.01 - KR); H04N 3/26 (2013.01 - EP US); H04N 3/27 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0844787 A1 19980527; EP 0844787 B1 20010801; CN 1134973 C 20040114; CN 1194532 A 19980930; DE 69711720 D1 20020508; DE 69711720 T2 20020808; KR 100270948 B1 20001101; KR 19980042779 A 19980817; TW 364257 B 19990711; US 5981952 A 19991109
DOCDB simple family (application)
EP 97402794 A 19971120; CN 97107270 A 19971121; DE 69711720 T 19971120; KR 19970063134 A 19971121; TW 86117388 A 19971120; US 97533397 A 19971120